Study On Heterogeneity Of Source Rocks And Prediction Of Favorable Oil Generation Areas In The First Member Of Qing Formation In Daqing Zijing Area

The Daqingzijing area structure is located in the middle and northern part of the Changling oil-rich sag,the best oil-sag sag in the central depression area of the southern Songliao Basin.It is located in the saddle of the Qian'anji depression and the Heidimiao depression.Although the rock is very developed,the abundance,type and maturity of the main source rocks are not clear.At the same time,the distribution area,thickness and vertical sand group horizon of the effective source rocks are not clear.In response to these problems,this paper firstly carried out the evaluation and characterization of the source rocks in the study area,quantitatively evaluated the source rocks through the geochemical measured parameters and the source rock evaluation of the sedimentary characteristics,and then applied the ?logR model to the region after improvement.After verification,the single well of the 4th sand group in the Qing section was promoted,and the heterogeneity of the vertical and plane of different sand groups in the space was further studied.The high-quality source rocks of the K1qn1-I sand group were analyzed and the overpressure was established.The logging interpretation model re-determines the lithology of the mudstone in the study area,and finally determines the favorable location of the source rock in the study area,and clarifies the scale and potential of the source rock of the Daqingzijing section.Mainly through the core sampling experiment to obtain the geochemical data,the research will be carried out from the large section to the sand source unit of the source rock research and analysis,and then combined with the mature source rock evaluation criteria of the region,the organic matter abundance and organic matter type of the source rock.Comprehensive evaluation of organic matter maturity,determination of the abundance of major source rocks in the Qing section of the study area,evaluation,source rock type evaluation and source rock maturity evaluation;further improvement by ?logR model Logging response characteristics,in order to ensure the positive determination of the model,the improved ?logR model is used to introduce a new lithology identification parameter GR,and the TOC logging parameter response prediction model is established,and the TOC prediction is performed on the covered well location in the study area;Through the TOC and dark mud ratio,combined with geochemical methods and sedimentology methods,the spatial heterogeneity of source rocks in the study area is studied,revealing that the source rock has strong heterogeneity in space;according to the depth method To calculate the pressure parameters of different sand groups in each well location in the study area,and to describe the distribution of super-pressure in the plane and vertical direction of different sand groups.According to the above research,the heterogeneity characteristics of different sand groups are revealed and characterized,so that the dominant factors affecting the source rocks are comprehensively predicted to predict the favorable source rocks of the study area,which is the exploration of tight oil and shale oil in Jilin oilfield.Development has laid a solid foundation.